Can anybody pls tell me limitations of BDC Session & Call transaction?

hi, Guys, this is srinivas.
How can we deside which method is to(BDC session/ Call transaction)
use to upload data to SAP database?
Can we run Call Transaction in Background?
Which is preferable for bulk data? and Why?
how can we restart Session if any error occurs?
Thanku?

Hi,
Hope it helps this......
SAP BDC INTERVIEW QUESTIONS & ANSWERS
1.       What is full form of BDC Session?
Batch Data Communication Session.
2.       What are the steps in a BDC session?
The first step in a BDC session is to identify the screens of the transaction that the program will process. Next step is to write a program to build the BDC table that will be used to submit the data to SAP. The final step is to submit the BDC table to the system in the batch mode or as a single transaction by the CALL TRANSACTION command.
3.       How do you find the information on the current screen?
The information on the current screen can be found by SYSTEM à STATUS command from any menu.
4.       How do you save data in BDC tables?
The data in BDC tables is saved by using the field name BDC_OKCODE and field value of /11.
5.       What is the last entry in all BDC tables?
In all BDC tables the last entry is to save the data by using the field name BDC_OKCODE and a field value of /11.
6.       What is a multiple line field?
A multiple line field is a special kind of field which allows the user to enter multiple lines of data into it.
7.       How do you populate data into a multiple line field?
To populate data into a multiple line field, an index is added to the field name to indicate which line is to be populated by the BDC session (Line index).
8.       Write the BDC table structure.
BDC table structure
FIELD                     TYPE                            DESCRIPTION
Program                CHAR (8)                      Program name of transaction.
DynPro                 CHAR (4)                      Screen number of transaction.
DynBegin              CHAR (1)                      Indicator for new screen.
Fnam                    CHAR (35)                     Name of database field from screen.
Fval                      CHAR (80)                     Value to submit to field.
9.       Does the CALL TRANSACTION method allow multiple transactions to be processed by SAP?
No. The CALL TRANSACTION method allows only a single transaction to be processed by SAP.
10.    Does the BDC-INSERT function allow multiple transactions to be processed by SAP?
Yes.
11.    What is the syntax for CALL TRANSACTION?
CALL TRANSACTION trans .
Three possible entries are there for MODE.
                  A          -           Show all screens.
                  E          -           Show only screens with errors.
                  N          -           Show no screens.
Regards,
V.Balaji
Reward if usefull

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Error while deploying CMP.. can u pls tell me...

Hi,
Below is the error my jboss 3.2.3 container is throwing when i tried to deploy my CMP entity bean. It says
my ejbFindByPrimaryKey() method must be implemented,but in a CMP i am told the container will take care of the implementation, one just has to specify it in the home object.. can anyone pls tell me where i could have gone wrong.
2004-07-09 12:47:39,825 INFO [org.jboss.deployment.MainDeployer] Starting deployment of package: file:/D:/jboss-3.2.3/server/default/deploy/product.jar
2004-07-09 12:47:40,404 WARN [org.jboss.ejb.EJBDeployer.verifier] EJB spec violation:
Bean : Product
Section: 12.2.2
Warning: The class must be defined as public and must not be abstract.
2004-07-09 12:47:40,404 WARN [org.jboss.ejb.EJBDeployer.verifier] EJB spec violation:
Bean : Product
Section: 12.2.5
Warning: Every entity bean must define the ejbFindByPrimaryKey method.
2004-07-09 12:47:40,419 ERROR [org.jboss.deployment.MainDeployer] could not create deployment: file:/D:/jboss-3.2.3/server/default/deploy/product.jar
org.jboss.deployment.DeploymentException: Verification of Enterprise Beans failed, see above for error messages.
     at org.jboss.ejb.EJBDeployer.create(EJBDeployer.java:491)
     at org.jboss.deployment.MainDeployer.create(MainDeployer.java:786)
     at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:641)
     at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:605)
     at sun.reflect.GeneratedMethodAccessor20.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
     at java.lang.reflect.Method.invoke(Unknown Source)
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This is my code
ProductBean
import javax.ejb.EntityContext;
import javax.ejb.EntityBean;
public abstract class ProductBean implements EntityBean {
     protected EntityContext ctx;
     //All set and get Methods
     public abstract String getName();
     public abstract void setName(String name);
     public abstract String getDescription() ;
     public abstract void setDescription(String desc);
     public abstract double getBasePrice() ;
     public abstract void setBasePrice(double baseprice);
     public abstract String getProductID();
     public abstract void setProductID(String prodname);
     //EJB required Methods
     public void ejbActivate(){
          System.out.println("ejbActivate called");
     public void ejbRemove(){
          System.out.println("ejbRemove called");
     public void ejbPassivate(){
          System.out.println("ejbPassivate called");
     public void ejbLoad(){
          System.out.println("ejbLoad called");
     public void ejbStore(){
          System.out.println("ejbStore called");
     public void setEntityContext(EntityContext ctx){
          System.out.println("setEntityContext called");
          this.ctx=ctx;
     public void UnsetEntityContext(){
          System.out.println("UnsetEntityContext called");
          this.ctx=null;
     public void ejbPostCreate(String productID,String name,String description,double basePrice){
          System.out.println("ejbPostCreate called");
     public ProductKey ejbCreate(String productID,String name,String description,double basePrice){
          System.out.println("Create method called");
          setProductID(productID);
          setName(name);
          setDescription(description);
          setBasePrice(basePrice);
          return new ProductKey(productID); // i am not sure which to retun,
          //return null;
                                           //Well just on a note for the above
                                          // I READ THAT CMP2.0 MUST RETURN NULL, BUT IN ED-ROMANS MASTERING
                                          // EJB IT SAYS THE BEAN MUST RETURN THE PRIMARY KEY CLASS.
                                          // I HAVE TRIED BOTH THE ABOVE RETURN VALUES, STILL I GET THE SAME
                                          / /ERROR.
HomeInterface
import java.rmi.RemoteException;
import java.util.Collection;
import javax.ejb.CreateException;
import javax.ejb.EJBHome;
import javax.ejb.FinderException;
public interface ProductHome extends EJBHome {
     public Product create(String productID,String name,String description,double basePrice)throws CreateException,RemoteException;
     public Product findByPrimaryKey(ProductKey key) throws FinderException,RemoteException;
     public Collection findByName(String name) throws RemoteException,FinderException;
     public Collection findByDescription(String desc) throws RemoteException,FinderException;
     public Collection findByBasePrice(double basePrice) throws RemoteException,FinderException;
     public Collection findByExpensiveProduct(double minPrice ) throws RemoteException,FinderException;
     public Collection findCheapProducts(double maxPrice) throws RemoteException,FinderException;
     public Collection findAllProducts() throws RemoteException,FinderException;
RemoteInterface
import java.rmi.RemoteException;
import javax.ejb.EJBObject;
public interface Product extends EJBObject {
     public String getName() throws RemoteException;
     public void setName(String name)throws RemoteException;
     public String getDescription() throws RemoteException;
     public void setDescription(String desc) throws RemoteException;
     public double getBasePrice() throws RemoteException;
     public void setBasePrice(double baseprice)throws RemoteException;
     public String getProductID()throws RemoteException;
ProductKey class - This is my PRIMARY KEY CLASS
import java.io.Serializable;
public class ProductKey implements Serializable{
     public String productID;
     public ProductKey(){
     public ProductKey(String prodID){
          productID=prodID;
     public String toString(){
          return productID;
     public int hashCode()     {
          return productID.hashCode();
     public boolean equals(Object prod){
          return ((ProductKey)prod).productID.equals(productID);
This is my ejb-jar.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE ejb-jar PUBLIC "-//Sun Microsystems, Inc.//DTD Enterprise JavaBeans 2.0//EN" "http://java.sun.com/dtd/ejb-jar_2_0.dtd">
<ejb-jar >
   <description><![CDATA[No Description.]]></description>
   <display-name>Generated by XDoclet</display-name>
   <enterprise-beans>
      <entity>
         <description><![CDATA[]]></description>
         <ejb-name>Product</ejb-name>
         <home>ProductHome</home>
         <local-home>ProductHomeLocal</local-home>
         <remote>Product</remote>
         <local-remote>ProductLocal</local-remote>
         <ejb-class>ProductBean</ejb-class>
           <persistence-type>Bean</persistence-type>
           <prim-key-class>ProductKey</prim-key-class>
           <reentrant>False</reentrant>
           <cmp-version>2.x</cmp-version>
          <abstract-schema-name>ProductBean</abstract-schema-name>
          <cmp-field> <field-name>productID</field-name></cmp-field>
          <cmp-field> <field-name>name</field-name></cmp-field>
          <cmp-field> <field-name>description</field-name></cmp-field>
          <cmp-field> <field-name>basePrice</field-name></cmp-field>
           <primkey-field>productID</primkey-field>
        <query>
             <query-method>
                  <method-name>findByName</method-name>
                       <method-params>
                            <method-param>java.lang.String</method-param>
                       </method-params>
             </query-method>
             <ejb-ql>
                       <![CDATA[SELECT OBJECT(a) from ProductBean as a where name=?1]]>
             </ejb-ql>
        </query>
        <query>
             <query-method>
                  <method-name>findByBasePrice</method-name>
                       <method-params>
                            <method-param>double</method-param>
                       </method-params>
             </query-method>
             <ejb-ql>
                       <![CDATA[SELECT OBJECT(a) from ProductBean as a where basePrice = ?1]]>
             </ejb-ql>
        </query>
        <query>
             <query-method>
                  <method-name>findExpensiveProducts</method-name>
                       <method-params>
                            <method-param>double</method-param>
                       </method-params>
             </query-method>
             <ejb-ql>
                       <![CDATA[SELECT OBJECT(a) from ProductBean as a where basePrice > ?1]]>
             </ejb-ql>
        </query>
        <query>
             <query-method>
                  <method-name>findCheapProducts</method-name>
                       <method-params>
                            <method-param>double</method-param>
                       </method-params>
             </query-method>
             <ejb-ql>
                       <![CDATA[SELECT OBJECT(a) from ProductBean as a where basePrice < ?1]]>
             </ejb-ql>
        </query>
                <query>
             <query-method>
                  <method-name>findAllProducts</method-name>
                       <method-params>
                            <method-param>double</method-param>
                       </method-params>
             </query-method>
             <ejb-ql>
                       <![CDATA[SELECT OBJECT(a) from ProductBean as a where productID IS NOT NULL]]>
             </ejb-ql>
        </query>
             </entity>
      </enterprise-beans>
   </ejb-jar>
This is my jboss.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE jboss PUBLIC "-//JBoss//DTD JBOSS 3.0//EN" "http://www.jboss.org/j2ee/dtd/jboss_3_0.dtd">
<jboss>
   <unauthenticated-principal>nobody</unauthenticated-principal>
   <enterprise-beans>
      <entity>
         <ejb-name>Product</ejb-name>
         <jndi-name>ProductHome</jndi-name>
          <local-jndi-name>ProductHomeLocal</local-jndi-name>
      </entity>
   </enterprise-beans>
   <resource-managers>
   </resource-managers>
</jboss>
This is my jbosscmp-jdbc.xml
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE jbosscmp-jdbc PUBLIC "-//JBoss//DTD JBOSSCMP-JDBC 3.0//EN" "http://www.jboss.org/j2ee/dtd/jbosscmp-jdbc_3_0.dtd">
<jbosscmp-jdbc>
   <defaults>
     <datasource>java:/OracleDS</datasource>
     <datasource-mapping>Oracle8</datasource-mapping>
   </defaults>
   <enterprise-beans>
      <entity>
         <ejb-name>Product</ejb-name>
         <table-name>ProductTable</table-name>
         <cmp-field>
            <field-name>productID</field-name>
            <column-name>PRODUCTID</column-name>
        </cmp-field>
         <cmp-field>
            <field-name>name</field-name>
            <column-name>NAME</column-name>
        </cmp-field>
        <cmp-field>
            <field-name>description</field-name>
            <column-name>DESCRIPTION</column-name>
        </cmp-field>
        <cmp-field>
            <field-name>basePrice</field-name>
            <column-name>BASEPRICE</column-name>
        </cmp-field>
      </entity>
   </enterprise-beans>
</jbosscmp-jdbc>

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<a href="http://help.sap.com/saphelp_nw2004s/helpdata/de/fa/09714d543b11d1898e0000e8322d00/frameset.htm">http://help.sap.com/saphelp_nw2004s/helpdata/de/fa/09714d543b11d1898e0000e8322d00/frameset.htm</a>
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Can anybody pls tell me limitations of BDC Session & Call transaction?

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